I've got a New Futaba 7C 2.4GHz Transmitter with R6004FF 4-Channel Micro Receiver for sale.
I've only flown with the 7C one time and the screen protector is still on the display.
The R6004FF receiver is new in package and has not been used.
I have the manual, neck strap, and cables that came with the 7C.

Look at page 6 (on the 6ex 2.4 you just change , add, or remove the trottle ratchet spring as seen in the pics.
I added the ratchet spring to mine to make it an Aero throttle ( tower sent the part for free)

On the 7ch they say you have to take it to a service center, but Idon't think ya have to, should be near the same to change.